Steel box section above bifold 1

[JT122]

Hi, I'm hoping to get some advice. I am enlarging a window to 1840mm to accommodate a bifold door on the ground floor of a 4 storey Victorian two skin property. Is a 100mm x 100mm x 5mm mild steel box section be strong enough as an internal lintel spring the floor joists. I can't fit a larger u beam due to space as there is a bay window and wall plate. Thanks in advance

 

[Agent666]

It certainly sounds a little skinny, but then I don't know the loads or the deflections as you didn't say.

Typically if supporting brickwork you'd want span/600 or similar which would most likely mean strength wouldn't be an issue.

 

[JAE]

If you are an engineer...simply calculate the properties and loads and determine the strength vs. required strength. Check deflections.
If you aren't - go hire one.


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